Exothermic Reaction

What is meant by heat released in reactions?

• Heat released in reactions refers to the energy that is given off to the surroundings during a reaction.

• Heat released in reactions refers to the energy that remains constant during a reaction

• Heat released in reactions refers to the energy stored in the products

• Heat released in reactions refers to the energy absorbed by the reactants

Provide an example of an exothermic reaction.

• Boiling of water

• Photosynthesis

• Combustion of methane

• Freezing of water

How do catalysts affect the rate of exothermic reactions?

• Catalysts change the nature of the reactants in exothermic reactions.

• Catalysts have no effect on the rate of exothermic reactions.

• Catalysts lower the activation energy barrier, increasing the rate of exothermic reactions.

• Catalysts increase the activation energy barrier, decreasing the rate of exothermic reactions.

Explain how temperature influences the rate of exothermic reactions.

• Temperature influences the rate of exothermic reactions by increasing the kinetic energy of molecules, leading to more frequent and energetic collisions.

• Temperature decreases the kinetic energy of molecules in exothermic reactions

• Lowering the temperature increases the rate of exothermic reactions

• Temperature has no effect on exothermic reactions

What role does surface area play in affecting the rate of exothermic reactions?

• Increasing surface area has no impact on the rate of exothermic reactions.

• Surface area increases the contact area between reactants, leading to more frequent collisions and higher reaction rates.

• Surface area decreases the contact area between reactants, leading to faster reaction rates.

• Surface area causes a decrease in reaction rates due to reduced reactant exposure.

Discuss the impact of concentration on the rate of exothermic reactions.

• Increasing the concentration of reactants generally increases the rate of exothermic reactions.

• Concentration has no impact on the rate of exothermic reactions.

• Increasing the concentration of reactants generally decreases the rate of exothermic reactions.

• Decreasing the concentration of reactants generally increases the rate of exothermic reactions.

Why is it important to consider the presence of inhibitors in exothermic reactions?

• To increase the reaction rate

• To reduce the cost of the reaction

• To enhance the color of the reaction mixture

• To prevent overheating, explosion, or control the reaction rate.

Describe the effect of pressure on the rate of exothermic reactions.

• Pressure increases the rate of exothermic reactions.

• Pressure changes the type of exothermic reactions.

• Pressure has no effect on the rate of exothermic reactions.

• Pressure decreases the rate of exothermic reactions.

How does the nature of reactants influence the rate of exothermic reactions?

• Reactants with higher energy levels or more unstable bonds typically have lower activation energies, leading to faster reaction rates.

• Unstable bonds in reactants lead to slower reaction rates in exothermic reactions.

• Reactants with lower energy levels have lower activation energies for exothermic reactions.

• Reactants with higher energy levels result in slower exothermic reactions.

Explain the concept of activation energy in exothermic reactions.

• Activation energy is the energy released during a reaction

• Activation energy is the same for all reactions

• Activation energy in exothermic reactions is the minimum energy required to initiate the reaction, allowing reactants to overcome the energy barrier and form products.

• Activation energy is not relevant in exothermic reactions